Coil-spring-forming machine.



WITNESSES: {I

G. B. BIGELOW.

COIL SPRING FORMING MACHINE.

APPLICATION IILED DBO. 20, 1909.

Patented June 24, 1913.

9 SHEETS-SHEET 2.

[NYE/ TOR orge E. 31' elow.

G. E. BIGELOW.

con. SPRING FORMING MACHINE.

I APPLICATION IILBD DEC. 20, 1909. 1,065,336.

G. E. BIGELOW.

COIL SPRING FORMING MACHINE.

APPLICATION FILED DEC. 20, 1909.

1 0 5 33 Patented June 24,1913.

9 SHEETSSHEET 5.

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; ,l' i m n 7 I LO a i N CD I! Aggy WITNESSES: l/WfNTOl? fie? Georyez'.BI ge/ow 6% BY f,

G. E. BIGELOW.

COIL SPRING FORMING MACHINE.

APPLICATION FILED DEO.20,1909.

1,065,336. Patented June 24,1913.

9 SHEETS-SHEET 6.

. \WI!ITIIIIIIIMIII\ I m I H i \Lfl I H I I In lNVE/WUR G'earye 5.51'low,

G. E. BIGELOW.

COIL SPRING FORMING MACHINE.

APPLICATION FILED D120. 20, 1909.

1,065,336, Patented June 24,1913.

9 SHEETS-SHEET 7.

Fig: 15

Fig- 17- WITNESSES:

INVf/VTUR ge E. Bl ge/ow.

G. E. BIGELOW.

Patented June 24, 1913.

9 SHEETS-SHEET 8.

1m 2 a f T g: 3

G. E. BIGELOW.

00m SPRING FORMING MACHINE.

APPLIGATION FILED D120. 20, 1909. 1,065,336, Patented June 24,1913.

9 SHEBTSSHBET 9.

.W/TNESSES: I

UNITED STATES PATENT OFFICE.

GEORGE E. IBIGELOW, OF WATERBURY, CONNECTICUT, ASSIGNOR DO THE IATTATUCKMANUFACTURING COMPANY, OF WATERBUBY, CONNECTICUT, A CORPORATION OICONNECTICUT.

COIL-SPRING-FORMING MACHINE.

Specification of Letters Patent.

Patented J une 24, 1913.

To all whom it may concern Be it known that I, Grronon E. BIonLow, acitizen of the United States, residing at Waterbury, in the county ofNew Haven and State of Connecticut, have invented certain new and usefulImprovements in Coil-Spring-Forming Machines, of which the following isa specification.

This invention relates particularly to the manufacture of coiled s ringsand particularly to those having ooks upon one or both ends.

Wire is coiled helically for various purposes by means of various kindsof mechanism. As wire comes in large coils or bundles it is customary toform the helical coil continuously in suitable lengths. It is customaryto cut up this helical coil which for convenience may be termed coilstock, into pro or lengths by means of automatic or han machines to formthe spri ng blanks. Then "the ends of the wire of the blanks areafterward bent to form hooks.

It is my object to automatically feed the coil stock, out off the end toform a blank and then automatically bend the wire of the ends of theblanks into hooks. The cut-off and bending in former machines has been imore or less irregular and uncertain and I have therefore particularlysought to give accurate feed to the coil stock so as to cut off blanksof uniform length and I have also sought to effect positive and accuratebending of the ends of the Wire or hooking as it is sometimes called. Itwill be.understood that the springs herein referred to are subsequentlyin most cases tempered. This tempering tightens the helical coil of thes rings and causes a relative rotation of the hooks at the opposite endsof the wire. In order therefore that the hooks in the finished temperedspring shall be parallel it is necessary that they should be slightlydisplaced relative to each other before telnpering. It is a furtherobject of my invention to automatically form the hooks at angles to eachother so that the subsequent tempering will bring theln into a commonlongitudinal plane.

The details of the invention in one form are illustrated in theaccompanying nine sheets of drawings and more fully described in thefollowing specification. Briefly described however, in order tofacilitate understanding of the dr'awin s I would state that the coilstock as broug t to the machine is grl ped by means of a special feedingchuck an advanced to the cut-off position and released. Just beyond thisposition the end of the stock is clasped by a pair of laterally movableholders and a mandrel or cutting arbor is inserted the length of thedesired blank. A cut-off punch or cutter is then brought down andco-acting with the end of the arbor as an abutment inside the coil, itsevers the wire to form a spring blank. The arbor is then Withdrawn fromthe blank and the coil stock is clamped by a jaw and slide and retracteda short distance from the cutter. When the arbor is withdrawn and thestock has been retracted, two sets or pairs of dies are brought intoaction to bend the ends of the wire coil blank to form the hooks. Thedies are then retracted and the holders release the spring and allow itto drop into a suitable container. Just about the time the chuck reachesits backward position the retracting clamp is released so that the stockis free to be moved forward as soon as the chuck grips it for theforward feed stroke. As the coil stock is fed forward it is rotated onits axis, through a small angle, so that the next cut of the wire isslightly out of alinement' longitudinally from the cut end at the frontend of the blank. The bending dies at the opposite ends of the springblank are arranged to travel on lines inclined relative to each other atan angle substantially equal to the angle through which the coil stockWas rotated. This forms the hooks at an angle to each other and withsubstantially the same length of Wire in each hook, as will be morefully understood hereinafter.

Figure 1 is a plan view of a machine embodying the improvements of myinvention, the feeding chuck being shown in its retracted position andthe severed blank held in position for forming the hooks. Fig. 2 is aside view showing the stock feeding mechanism. Fig. 3 is a side view ofthe plate for causing rotation of the feeding chuck. Fig. 4 is avertical section of the stock feeding and retracting means. Fig. 5 is alongitudinal horizontal section of the feeding chuck on the plane of theline 44 of Fig. 7. Fig. 6 is a detail vertical section of a chuck jaw.Fig. 7 is a transverse section of the machine showing an end view of thefeeding chuck. Fig. 8 is an end view of the coil stock illustrating theangle of rotation of the stock during the feeding movement. Fi 9 is adetail view of the guide roller an carrying plate which is attached tothe feeding chuck for co-acting with the guide plate of Fig. 3. Fig. 10is a transverse section of the machine showing the means for feeding andretracting the coil stock. Fig. 11 is a vertical transverse section ofthe stock retracting slide and clamp. Fig. 12 is a detail sectional viewof the guide for the front pair of bending dies. Fig. 13 is alongitudinal vertical sectional view of the machine showing the holdingand cut-off mechanism. Fig. 14 is a detail longitudinal vertical sectionshowing fragments of the cutter and arbor on a larger scale. Fig. 15 isa transverse sectional view of the machine showing the blank holding andcut-off mechanism. Fig. 16 is a vertical transverse section of thecutter and arbor. Fig. 17 is a plan view of the severed blank showingthat the ends of the wire of the coil are not in longitudinal alinement.Fig. 18 is a transverse sectional view of the machine showing thebending dies which form the hooks at the rear end of the blank. Fig. 19is a plan View of the blank holders and bending dies. Fig. 20 is an endview of a blank with the bending dies ready to operate. Fig. 21 is atransverse sectional view of the machine showing the bending dies whichform the hooks on the front end of the blank and the mechanism foroperating same. Fig. 22 is a plan view of the product of the machine.

The machine is driven by power of any suitable type applied throughshaft 1 and gears 2 and 3 to shaft 4 (see Fig. 7). The latter shaftthrough bevel gears 5 and 6 drives cross shaft 7 which through bevelgears 8 and 9 drives shaft 10 which in turn through bevel gears 11 and12 drives shaft 13. Shaft 4 carries a series of suitable cams whichoperate one of the blank holding jaws, the cut-off punch, the clamp forretraction of the coil stock and one die of each pair of the hookin orbending dies. The cutting arbor which serves as one part of the cut-offmechanism is operated from cross shaft 7. Shaft 10 carries suitable camsfor operating one of the blank holding jaws and one die of each pair ofhook bending dies. The stock feeding chuck is operated from shaft 13 andthis in turn moves the retracting clamp back and forth allowing acertain play or lost motion as will be hereinafter set forth.

Stock feeding, (see Figs. 1 to 10.)The coil stock 14 is fed forwardintermittently by means of what for convenience I will term a chuckwhich is mounted to reciprccate. The carriage 15 is guided in longi- Itudinal ways in the bed or frame 16 of the machine. A bushing 17 screwedinto the rear of the carriage affords a bearing for the feed tube 18. Acollar or nut 19 on the bushing serves to prevent its working loose fromthe carriage. 20 and 21 are collars secured onto the end of the feedtube and between which is located the yoke 22 which fits loosely on thehub of collar 20. The

by the arms at the upper end of lever 24. This lever is pivoted orhinged at the bottom of the machine (not shown) and is the usual mannerof adjustable crank connections so that the throw of the lever may beadjusted. The crank plate 26 is carried by gear 27 which meshes withgear 28 on shaft 13. In this way the rotation of shaft 13 causesoscillation of the lever 24 and lone By adjusting the collars 20 and 21on the feed tube 18 the position of the tube may be varied. mounted inthe collar 31 of the carriage 15. For the purpose of facilitatingassembl ng and taking apart, the upper part of the collar 31 may be maderemovable and bolted or otherwise secured in place in any suitablemanner. Similarly the rear end 32 of the carriage may be bolted orotherwise secured in place. To reinforce the parts I prefer to connectthe front and rear of the top of the carriage by means of a bolt 33. Thechuck body 30 I prefer to form in two parts bolted or otherwise suitablysecured together. Arranged within the chuck body is a pair of jaws 34,34 which are radially movable to a limited extent so as topermit them togrip the coil stock and to be released at the proper moments. Each jawhas a pin 35 which passes through an inclined slot 36 in the end of abar 37 which extends through the jaw. The two bars 37, 37 are secured toflanges 38, 38 on the end of the feed tube 18. As the feed tube 18 ismoved forward (that is to the left as viewed in Fig. 1) the bars 37, 37which project forwardly from the front end force the jaws 34, 34inwardly and thus grip the stock and feed it forwardly. As soon as thejaws grip the stock further forward movement of the bars 37, 37 and thefeed tube 18 independent of the chuck body 30 and carriage 15 isprevented and the parts move forwardly together. When the feed tube 18starts backward the inertia of the chuck carriage and body causes themto lag behind and thus the jaws 34, 34 are disengaged or retracted fromthe stock and the chuck moves back free of the stock.

Rotation of the stock, (see Figs. 1 to 10.)As before mentioned the stockis given a partial rotation during its forward movement. The plate 40 isbolted or othertrunnions 23, 23 of this yoke 22 are engaged" connectedby rod 25 to crank plate 26;:in

gitudinal reciprocation of the feed shaft 18.-

The body 30 of the chuck is j mousse wise suitably secured to the rearend of the chuck body 30. This plate carries a roller 41 which projectsinto an inclined slot 42 in guide plate 43. The chuck body 30 is mountedin the collar 31 of the carriage so that it can rotate. As the chuck ismoved forward the roller 41 is guided in the slot 42 and this causes thechuck to oscillate through a small angle as the chuck is reciprocated.As the jaws of the chuck only grip the stock when moving forwardly,obviously the stock is only rotated when being fed forwardly. As hereinshown, the rotation, as viewed inthe direction of feed, is left handedor anti-clockwise and takes place intermittently between the cut oilstrokes. In order to be able to vary the angle of rotation and thus varythe relative position of the opposite ends of the wire of the blank Ihave made the plate 43 adjustable. Its hub 44 is clamped by nut 45 tothe support 46. Stud 47 carried by plate 43 pro ects through a slot 48in the support 46 and thus the plate may be clamped adjustably inposition by a nut 49.

Stock and bhnk holding, (see Figs. 1, 13, 15 and 19.)Slides 50 and 51are reciprocated by means of cams 52 and 53 respectively on shafts 10and 4. Each slide carries a jaw such as 54 and 55 having their facespreferably cut so as to securely grip the end of the coil stock when itis fed between them. Each jaw preferably has a slight freedom of motionlongitudinally of its slide and is guided for instance by means of abolt 56 passing through a slot in the jaw and a spring 57 adjustable bymeans of a set screw or bolt 58 presses the jaw inward. The holders thusgive a yielding grip upon the stock. The cams 52 and 53 are so timed asto grip the end of the coil stock when it is fed forward to the properposition. The holders 54 and 55 retain their grip upon the coil endwhile it is being cut oil and also while the ends of the severed blankare being bent into hook form. The holders are then retracted and ermitthe product to fall through the opening 59 into a suitable container.Different sized holders may be substituted for different sizes ofsprings.

('utt'ing 0 the stock, (see Figs. 1, 8, and 13 to 17.)-VVhen the coilstock is fed between the holdin jaws 54 and 55 an arbor or mandrel 60 isinserted. This arbor is removably and adjustably clamped as for instanceby one or more set screws 61 to slide 62 which is longitudinallyreciprocable by means of cam 63 on shaft 7. The end of the arbor is cutaway so as to provide a vertical cutting shoulder 64 and thelongitudinal position of the arbor is adjusted so that its end projectsbeyond the rear ends of the holding jaws 54 and 55 substantially thediameter of the wire of the coil stock. The

diameter of the arbor is substantially the same as the internal diameterof the coil stock. Above the end of the arbor is located a cutter orunch 65 having a shoulder or cutting e go 66 adapted to co-act with thecutting arbor to sever the coil stock. The lower end of the cutter ispreferably concave as indicated in Figs. 14 and 16., This cutter 65 isclam ed to lever 67 by means of one or more olts or screws such as 68and has an adjustable abutment 69 so that the vertical position of thecutter may be varied to take up wear or otherwise. The cam 70 on shaft 4is so timed as to operate lever 67 and cutter 65 immediately after theend of the coil stock is grasped by the holding jaws 54 and 55 and thecutting arbor 60 has been inserted ready for cutting off. The cuttingarbor 60 and the holding jaws 54 and 55 coiiperate to properly supportthe coil stock durin the severing operation. As soon as the b ank issevered the cutting arbor is retracted by the cam 63. Lever 67 iscarried by the longitudinally adjustable arm 39 so that the longitudinalposition of the cutter 65 may be altered for different sizes of wire orlengths of blanks desired.

Retractz'ng the coil stock, (see Figs. 1, 4,- 10, and 11.)-As soon asthe blank has been severed, the coil stock is retracted or drawnbackward a short distance so as to permit the bending dies to be broughtinto operation at the rear end of the blank. The retracting slide 71 hasa central passage 72 for the coil stock and is reciprocablelongitudinally. The slide is moved forward by means of the chuck body 30which engages the stop 73 of the slide on its forward movement. Thisstop is preferably adjustable so as to vary the movement of the slide.The clamping jaw 74 which rojects downwardly into the passage 72 in theslide is pressed upward by means of one or more springs such as 75. Onits upper face rests a roller 76 carried by arm 77 pivoted at 78. On thesame pivot is a lever 79 one arm of which carries an adjustable setscrew or bolt 80 engaging the arm 77 and the other arm of which restsupon the cam 81. This cam is timed so that when the coil stock and theslide 71 are moved forward by the feeding chuck the long arm of thelever 79 will be raised and this forces the short arm of the lever andthe roller bearing arm 77 downwardl so as to cause the lower face of theaw 4 to clamp or grip the coil stock at substantially the moment thefeeding chuck reaches the extreme forward extent of its feed stroke. Abell crank lever 82 has one arm slotted to engage the pin 83 in thelower part of the retracting slide 71. The other arm carries a roller 84adapted to co-act with the incline or cam 85 which is carried by thecarriage 15 of the feed chuck.

When the feeding chuck moves to the left as viewed in Fig. 1 theretracting slide 71 is engaged and moved to the left and this tilts thebell crank lever 82 so that the roller 84 is moved back of theprojection of the cam 85. When the feeding chuck carriage moves backwardon its return stroke the cam 85 forces the roller 84 outward and thistilts the lever 82, retracts the slide 71 and the coil stock which hasbeen meanwhile grasped by the jaw 74. The amount of the retraction willof course depend upon the relative roportions of the arms of the lever82 an the shape and dimensions of the cam 85. In order to be able tovary the retracting action I have clamped the cam 85 to the chuckcarriage by means of one or more bolts such as 86 and have provided anadjustable stop or take-up screw 87 (see Fig. 1). In order to facilitatethe retraction of the coil stock, which is sometimes of considerablelength, I prefer to provide one or more rollers such as 88, in F ig.

orward which the stock rests as it is fed and retracted intermittently.

Bending 01' forming the hooks, (see Figs. 1, 12 and 18 to 21.)Wl 1ile ofcourse the hook on the front end of the blank might be formed withoutretracting the stock I prefer to form the hooks on both ends of theblank simultaneously while the coil stock is retracted. The slides 90and 91 carry the bending dies 92 and 93 respectively for forming thehook on the rear of the blank. These slides are operated by cams 94 and95 on shafts 10 and 4. Each die may be adjusted in any suitable mannerfor instance by a set screw or bolt 96. One die has a wedgeshaped point97 which is rounded as viewed from the side and adapted to be insertedunder the end coil of the blank. The other die has a curved recess 98 toengage the part of the coil opposite the free end and hold it inposition while the wedge 97 is bending the end over. The notch 99 isprovided for the wire of the coil at the point where it is bent over.The shoulders 100 and 101 are inclined somewhat so .as to cooperate ingrasping and properly setting the hook as it is bent out. These bendingdies may be adjusted on their slides longitudinally of the machine tocorrespond with different lengths of blanks and of course differentsizes and shapes of dies may be substituted when desired. As beforementioned in order to compensate for the distortion of the spring due totempering and hardening, the hooks on the opposite ends are formed outof line in this machine. In order to accomplish this and have the hooksof equal size and uniform I rotate the stock after one blank has beencut off through an angle such as the angle X in Fig. 8 so that the frontend of the wireis not in line longitudinally with the rear end of thewire of the blank. \Vhen the stock is cut ofl, the rear end of the wireof the blank being directly over the axis of the blank the rear hookforming dies are operated horizontall The front end of the wire of theblank eing displaced through the angle X, I operate the front hookforming dies 105 and 106 inclined at an angle to the horizontalcorresponding to the angle X (see Fig. 21). These dies 105 and 106 arethe same as the dies 92 and 93 respectively and are supported by holderswhich slide in the support or guide member 107. This support has a hub108 secured in the frame part 109 in any suitable manner. The die 105 isreciprocated in the guide member by means of swinging link 110 pivotedat 111. The driver 112 is connected to link 110 and has its rear outerend bifurcated or forked at 113 and embraces a block 114 somewhatloosely mounted upon shaft 4. The roller 115 carried by the driver fitsoperably in the groove of cam 116. Rotation of the shaft 4 thus causesreciprocation of the die member 105. Die member 106 is operated in asimilar manner through link 117 pivoted at 118 and connected to driver119 which is bifurcated at 120 and embraces the block 121 on shaft 10.The driver roller 122 works in the groove of cam 123. To provide forformin the hooks on the front end of blanks in which, what may becalled, the tempering correction angle X is greater or less than the oneshown, the-guide 107 may be adjusted on its axis to a greater or lesserangle of inclination. Corresponding with this adjustment the pivotalaxis 111 on link 110 is adjusted up or down in the slot 124 of themachine frame and the pivotal axis 118 of link 117 is adjusted up ordown and clamped by means of one or more bolts such as 125. The coiledstock 14 is started by hand into the tube 18, between the jaws 34, 34,under the clamp 74 and between the holders 54 and 55. The machine isthen started and the arbor 60 moves forward into the end of the coil andthe holders 54 and 55 grasp the end of the coil. The cutter 65 thendescends and severs the blank from the end of the stock. The cutter 65then rises, the arbor 60 is retracted toward the left (Fig. 1), and thetwo sets of dies 92, 93 and 105, 106 are forced inwardly to bend theends of the blank into hooked form as shown in Fig. 22. The dies arethen retracted and the holders 54 and 55 separated so that the productis released and drops out of the machine. As the blank is severed fromthe end of the stock, the main portion of the stock is retracted a shortdistance by the clamp 74 and slide 71 so as to clear the end of thestock from in front of the dies 92 and 93. The retraction is through adistance less than the required feed. \Vhile the operation justdescribed is taking place the chuck 30 is moving toward the right. Whenit starts 7 backward toward the left the jaws 34, 34 of the chuck graspthe stock and give it a partial rotation through the angle X (Fig. 8) asit is fed forward to the holders 54 and 55, when the machine-1s ready torepeat the operation above described.

Among other advantages I am able to operate this machine at a high rateof speed and nevertheless to produce a uniform prodnot. It will be seenthat I have made provision for adjustment to take care of s rings ofdifferent lengths and diameters an wire of different gages. Themechanism also permits me to vary the tempering correction angle whennecessary for instance by reason of the variations in the quality ofsteel or of the particular degree of tempering required.

I have only illustrated one form of the 1nvention but I wish itunderstood that I do not limit my claims except as therein specificallystated and that I contemplate a broad range of equivalents.

lVhat I claim is 1. In a coil-spring forming machine, jaws for feedingthe coil stock, meafiS for severing a blank therefrom, means forretracting the stock, and means for forming hooks on both ends of theblank and mechanism for bringing said means in operation successively,sub stantially as described.

2. In a coil-spring forming machine, jaws for feeding the coil stock,means for severing a blank therefrom, means for retracting the stock,means for varying the retraction, and means for forming hooks on bothends of the blank and mechanism for bringing the feeding, severing,retracting and forming means into operation successively, substantiallyas described.

3. In a coil-spring forming machine, jaws for feeding the coil stock,means for severing a blank therefrom, means for retracting the stock,means for forming a hook on the rear end of the blank and mechanism forbringing said means into operation successively, substantially asdescribed.

4. In a coil-spring forming machine, jaws for feeding the coil stock,means for severing a blank therefrom, means for retracting the stock,and a pair of mechanically operated dies for forming a hook upon one endof the blank and mechanism for bringing said means into operationsuccessively, substantially as described.

5. In a coil-spring forming machine, jaws for feeding coil stock, meansfor severing a blank therefrom, and a pair of mechanically operated diesfor forming a hook upon the front end of the blank and mechanism forbringing said means into operation successively, substantially asdescribed.

6. In a coil-spring forming machine, jaws for feeding coil stock, meansfor severing a blank therefrom, means for retracting the stock, and twopairs of mechanically operated dies for forming hooks upon the ends ofthe blank and mechanism for bringing said means into operationsuccessively, substantially as described.

7. In a coil-spring forming machine,means for holding the end of a pieceof stock stationary, means for severing a blank from the end while thusheld, and dies for bending one end of the blank while so held and mechanism for bringing said means into opera tion successively,substantially as described.

8. In a coil spring forming machine,means for holding the end of thecoil stock stationary, means for severing the end while thus held, anddies for bending the ends of the blank while so held and mechanism forbringing said means into operation successively, substantially asdescribed.

9. In a coil spring forming machine,means for holding the end of a pieceof stock, means for severing a blank from the end while thus held, anddies for bending the two ends of the blank into hooks lying in planes atan angle to each other.

10. In a coil spring forming machine, jaws for feeding coil stock, meansfor holding the end thereof 'stationary, and a air of mechanicallyoperated dies for bending one end of the coil when grasped by saidholders and mechanism for bringing said means into operationsuccessively, substantially as described.

11. In a coil spring forming machine, jaws for feeding coil stock, meansfor holding the end thereof stationary, and a pair of mechanicallyoperated dies for bending the front end of the coil when held by saidineans and mechanism for bringing said means into operationsuccessively, substantially as described.

12. In a coil-spring forming machine, a pair of gripping jaws, a pair ofcutters and two pairs of bending jaws, and mechanism for bringing saidelements into operation successively, substantially as described.

13. In a coil spring forming machine, means for holding a blank and twopairs of dies for bending the ends thereof into hooks, the plane ofoperation of one pair of dies being inclined relative to the plane ofoperation of the other pair of dies.

14. In a coil spring forming machine, means for holding a blank and twopairs of dies for bending the ends thereof into hooks, one pair of diesbeing adjustable relative to (tihe plane of operation of the other pairof 15. In a coil-spring forming machine, two pairs of dies for bendingthe ends of a blank into hooks, the plane of operation of one pair ofdies being inclined relative to the plane of operation of the other pairof dies, and means for varying the inclination.

16. In a coil-spring forming machine, a

' away from each other,

means for reciprocating said arbor, and a cutter for severing the stockwhen on said arbor.

41. In a coil-spring forming machine, lneans for feeding stock, acutting arbor, means for operating the said arbor, and a cutter having aconcave end for severing the stock when on said arbor.

42. In a coil-spring forming machine, means for feeding stock, a cuttingarbor, means for reciprocating the said arbor, and a pivoted cutter forsevering the stock when on said arbor.

43. In a coil-spring forming machine, means for holding a blank, acutting arbor, means for inserting and retracting said arbor, and acutter for cooperating with said arbor to out said blank when so held.

44. In a coil-spring forming machine, a cutting arbor, means forinserting and retracting said arbor, and a cutter for cooperating withsaid arbor to out said blank.

45. In a coil-spring forming machine, means for holding a blank, anadjustable cutting arbor, means for inserting and retracting said arbor,and a cutter for cooperating with said arbor to out said blank when soheld.

46. In a coil machine, means for feeding coiled stock, an arbor inalinement therewith, a cutter cooperating with said arbor to sever acoil, holders for gripping the stock while on the arbor, means forretracting the arbor, and jaws for bending the ends of the severed coilwhile held by the holders.

47. In a coil-springmachine, a cutting punch, a cutting arbor, and meansfor feeding coil stock, said punch and arbor being both adjustablelongitudinally of the direction of feed of the stock.

48. In a machine of the character described, stock holding means, acutting arbor, means for inserting said arbor, and a cutter cooperatingtherewith when the stock is grasped by said holding means.

49. In a coil-spring machine, a horizontal cutting arbor, means formoving it longitudinally, a vertically operating cutter, and laterallyoperating bending dies.

50. In a coil-spring machine, a pair of slides, grooved coil holdingjaws carried thereby, springs pressing said jaws toward each other,means for adjusting said jaws and means for operating said slides.

51. In a coil-spring machine, stock feeding means, and stock retractingmeans comprlsing a reciprocating slide, a clamp jaw carried thereby, aroller engaging the top of said clamping jaw, and means for pressingsaid roller downward when the slide is retracted.

52. In a coil-spring machine, blank holding means and a pair of bendindies at each end thereof, one pair of dies eing adjustable about theaxis of the holding means.

53. In a coil-spring machine, blank holding means, an angularlyadjustable guide adjacent one end thereof, and bending dies mounted insaid guide.

54. In a coil-spring machine, an angularly adjustable guide, bendingdies mounted to slide therein, a swinging arm connected to each die andhaving its pivotal axis adjustable, and a driver connected to each arm.

55. In a coil-spring forming machine, two side and end shafts, feedingmeans driven from one end shaft, a cutting arbor driven from the otherend shaft, and holding, cutting, and bending means operated from theside shafts.

56. In a coil spring forming machine, a chuck for grasping coiled stockand moving it longitudinally and means for moving said chucklongitudinally and means for giving said chuck a partial backwardrotation.

57. In a coil spring machine, a coil feeding device, an arbor, means formoving said arbor longitudinally of the coil, bending jaws, and meansfor bringing said mechanism successively into operation.

58. In a coil spring machine, a coil feeding device, an arbor, means formovingthe arbor longitudinally of the coil, means for cutting off thecoil blank, bending jaws, and means for operating the said mechanisms.

59. In a machine of the character described the combination of a pair ofjaws for gripping the coil, cooperating cutter elements for severing ablank from the stock, two pairs of reciprocating bending jaws forforming the books on the ends of the blank, and means for operating saidgripping jaws, said cutter elements and said bending jaws automatically.

GEORGE E. BIGELOV.

\Vitnesses \YM. M. SAUNDERS, EDWARD J. RAY.

